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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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package org.junit.runner.notification;

import org.junit.internal.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runner.Result;

/**
 * If you need to respond to the events during a test run, extend RunListener
 * and override the appropriate methods. If a listener throws an exception while processing a
 * test event, it will be removed for the remainder of the test run.
 *
 * For example, suppose you have a Cowbell
 * class that you want to make a noise whenever a test fails. You could write:
 * 
 * public class RingingListener extends RunListener {
 *    public void testFailure(Failure failure) {
 *       Cowbell.ring();
 *    }
 * }
 * 
 * 
 *
 * To invoke your listener, you need to run your tests through JUnitCore.
 * 
 * public void main(String... args) {
 *    JUnitCore core= new JUnitCore();
 *    core.addListener(new RingingListener());
 *    core.run(MyTestClass.class);
 * }
 * 
 * 
 *
 * @see org.junit.runner.JUnitCore
 * @since 4.0
 */
public class RunListener {

    /**
     * Called before any tests have been run.
     *
     * @param description describes the tests to be run
     */
    public void testRunStarted(Description description) throws Exception {
    }

    /**
     * Called when all tests have finished
     *
     * @param result the summary of the test run, including all the tests that failed
     */
    public void testRunFinished(Result result) throws Exception {
    }

    /**
     * Called when an atomic test is about to be started.
     *
     * @param description the description of the test that is about to be run
     * (generally a class and method name)
     */
    public void testStarted(Description description) throws Exception {
    }

    /**
     * Called when an atomic test has finished, whether the test succeeds or fails.
     *
     * @param description the description of the test that just ran
     */
    public void testFinished(Description description) throws Exception {
    }

    /**
     * Called when an atomic test fails.
     *
     * @param failure describes the test that failed and the exception that was thrown
     */
    public void testFailure(Failure failure) throws Exception {
    }

    /**
     * Called when an atomic test flags that it assumes a condition that is
     * false
     *
     * @param failure describes the test that failed and the
     * {@link AssumptionViolatedException} that was thrown
     */
    public void testAssumptionFailure(Failure failure) {
    }

    /**
     * Called when a test will not be run, generally because a test method is annotated
     * with {@link org.junit.Ignore}.
     *
     * @param description describes the test that will not be run
     */
    public void testIgnored(Description description) throws Exception {
    }
}